How to get twitter feeds from twitter api in angularjs - angularjs

Question

I am using index.html for displaying the feeds.
My app.js is-
function randomString(length, chars) {
var result = '';
for (var i = length; i > 0; --i) result +=chars[Math.round(Math.random() * (chars.length - 1))];
return result;
}
function twitterCallback(data){
alert(responseJson.status.text);
}
var app=angular.module('store',[]);
app.controller('indexController', function($scope, $http) {
var unixtime=Math.round((new Date()).getTime() / 1000.0),
nonce=randomString(32,'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');
var httpMethod = 'GET',
url = 'https://api.twitter.com/1.1/statuses/home_timeline.json',
parameters = {
oauth_consumer_key : 'AD6SEy1m3XkggNTuYw5SUl4dv',
oauth_nonce : nonce,
oauth_signature_method : 'HMAC-SHA1',
oauth_timestamp : unixtime,
oauth_token : '3131481153-I9k4ZvdnePO42lOH0EJQNQcAHoyim6XrFFzFk90',
oauth_version : '1.0',
screen_name:'twitterapi',
callback:'twitterCallback'
},
consumerSecret = 'xxxxx',
tokenSecret = 'xxxxx',
signature = oauthSignature.generate(httpMethod, url, parameters, consumerSecret, tokenSecret,
{ encodeSignature: true});
$http.jsonp(url, {
headers: {
'Authorization':
'OAuth oauth_consumer_key="AD6SEy1m3XkggNTuYw5SUl4dv",' +
'oauth_signature_method="HMAC-SHA1",' +
'oauth_timestamp='+unixtime +
'oauth_nonce='+nonce +
'oauth_version="1.0",' +
'oauth_token="3131481153-I9k4ZvdnePO42lOH0EJQNQcAHoyim6XrFFzFk90",'+
'oauth_signature='+signature
},
params:{screen_name:'twitterapi',
}
}).success(function (data)
{
$scope.tweets = data;
}).error(function(data){
console.log('error');
}) ;
});
How to connect to twitter and define twitter-callback?Please specify how to connect with twitter.
I am getting
GET home_timeline.json?screen_name=twitterapi
400 Bad Request